Most of the bridges you can find here:

https://github.com/mautrix

Documentation is here:

https://docs.mau.fi/bridges/index.html

I have an older Mac dedicated to this singular purpose. It works well. That bridge + SmsMatrix on my android phone means I can get my text messages & iMessages from my (all iPhone family) anywhere I can load the Riot web app.

Note that it's kind of an interesting hack: IIRC It's just talking to the local sqlite data store that the Mac is receiving messages to. I worry that apple may one day say "Nope" and shut down this "API" we were never supposed to have.

Yes. Self-host using this Ansible playbook has been a joy.

https://github.com/spantaleev/matrix-docker-ansible-deploy

A top notch well managed Ansible setup!

It hasn’t integrated in a good iMessage bridge yet last I checked. Hopefully soon!

I've been self hosting it all long before I knew it had a commercial front (Beeper), the docs are fine. That's from the POV of someone who was already running a Matrix server, though.